I used to have BPK keylogger on my system to monitor who was on my pc when I wasn't home. When Microsofts tool came out, it picked it right up and asked me if I wanted to delete it, accidentally, I did and the keylogger was no more. It saw it as a trojan, also, Spybot and Adware picked it up and wanted to delete it, but I exluded it from the scan so it CAN it removed f. I doubt the main file is hidden anyways. BPK was in stealth mode which meant there wasn't no uninstaller, no startup splash screen, no icon, etc. but there was a folder, called by default, bpk, or whatever I wanted to call it. I doubt that it will be that hard to remove. And reformatting is not the answer.